US20110039596A1 - Basestation power control - Google Patents
Basestation power control Download PDFInfo
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- US20110039596A1 US20110039596A1 US12/936,381 US93638109A US2011039596A1 US 20110039596 A1 US20110039596 A1 US 20110039596A1 US 93638109 A US93638109 A US 93638109A US 2011039596 A1 US2011039596 A1 US 2011039596A1
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- Prior art keywords
- basestation
- transmit power
- power
- adjustment factor
- cpich
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/002—Reducing depolarization effects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
Definitions
- This invention relates to a power control system, for use in a basestation of a mobile communication system.
- power control of transmissions in a mobile communications system is important, particularly in cellular systems using Code Division Multiple Access (CDMA), but not only in such systems. If transmission powers are too low, then transmitted signals will not be able to be received correctly. However, if transmission powers are too high, this implies excessive battery use (in the case of uplink transmissions, from the wireless device to the basestation), and an increased possibility of interference with other transmissions, and hence reduced system capacity. Therefore, communications standards that define the requirements of such systems describe in detail the manner in which such power control can be achieved.
- CDMA Code Division Multiple Access
- the 3GPP specifications define the format of messages that can be exchanged between a cellular basestation and a mobile terminal, in order to achieve the required transmission powers.
- femtocell basestations which are intended to provide cellular coverage over small areas, for example within a user's home or office premises. It has been found that the messages defined in the 3GPP specifications do not adequately cover all of the possible deployments of such a femtocell basestation.
- a basestation for use in a cellular communications network, having a mechanism for reporting its transmit power, the basestation being configured, when its transmit power is outside a reportable range, to report an adjusted transmit power within the reportable range, and also to transmit an adjustment factor, by which the adjusted transmit power differs from the transmit power.
- a basestation for use in a cellular communications network, wherein the basestation is configured to adapt its power settings based on a reported transmit power of at least one other basestation, and is further configured to detect the reported transmit power of the at least one other basestation and to detect an adjustment factor transmitted separately by the at least one other basestation, and to adapt its power settings based on a sum of the reported transmit power and the adjustment factor.
- FIG. 1 illustrates a part of a mobile communications network.
- FIG. 2 is a flow chart, illustrating a first method in accordance with the invention.
- FIG. 3 is a flow chart, illustrating a second method in accordance with the invention.
- FIG. 1 illustrates a part of a cellular mobile communications network.
- a first femtocell basestation 10 has a connection to a wide area network (WAN) 12 such as the internet, allowing it to connect into the core network 14 of a mobile network operator.
- WAN wide area network
- a second femtocell basestation 16 operated by the same mobile network operator has a similar connection over the wide area network (WAN) 12 , allowing it too to connect into the core network 14 .
- WAN wide area network
- Part of the core network 14 is a management node 20 , which is able to monitor the operation of the femtocell basestations 10 , 16 , and is able to send information to them over the wide area network 12 .
- each of the femtocell basestations 10 , 16 is intended to provide coverage over a small area, for example within a particular property, allowing a mobile terminal, such as the mobile phone 18 , to establish a connection to one of the femtocell basestations, and therefore obtain a cellular service. It will therefore be appreciated that the femtocell basestations 10 , 16 may be located very close to one another, for example on either side of a wall dividing two properties, or on different floors of a building.
- the femtocell basestations 10 , 16 are only intended to provide coverage over small areas, they do not need to transmit with high power, and a mobile terminal in communication with a femtocell basestation does not need to transmit with high power.
- the mobile communications network containing the femtocell basestations 10 , 16 is operating in accordance with the 3GPP specifications, which define the power control algorithms to be performed by basestations and by mobile devices.
- each femtocell basestation 10 , 16 operates in substantially the same way as conventional basestations, and this will not be described further, except as required for an understanding of the present invention. However, it is worth noting that each femtocell basestation 10 , 16 is able to detect transmissions from other cellular basestations, including other femtocell basestations. That is, each femtocell basestation 10 , 16 includes circuitry for detecting transmissions on system downlink frequencies, as well as the circuitry that it must include to be able to detect transmissions on system uplink frequencies.
- the femtocell basestations 10 , 16 therefore detect the powers of signals transmitted from other basestations, including other femtocell basestations and macrocell basestations, and set their initial maximum downlink power and their initial maximum uplink power based on these detected powers.
- a detailed description of the mechanism by which these parameters are set is not required for an understanding of the present invention.
- one feature of the power control is that, when femtocell basestations are located close together, they set their initial maximum downlink powers to be equal. This avoids the situation where each might otherwise be trying to increase its power to be higher than the other.
- One femtocell basestation in order to determine the initial maximum downlink power of a nearby femtocell basestation, can in principle use the value for the CPICH (Common Pilot Channel) transmit power that is broadcast by that nearby femtocell basestation in accordance with the 3GPP specifications.
- CPICH Common Pilot Channel
- femtocell basestations can be deployed in ways not envisaged in the 3GPP specifications, with the result that the nearby femtocell basestation may not be able to report its CPICH transmit power accurately using the mechanism provided in the 3GPP specifications.
- FIG. 2 therefore illustrates a method, by which a femtocell basestation can report its transmit power.
- the femtocell basestation determines its present transmit power, and in particular its present value for the variable CPICH_Tx_Power.
- the 3GPP specification defines a mechanism by which a basestation can report this value, by including the value in a specified one of the system information blocks. Mobile devices in the coverage area of the basestation can detect the reported value, as required.
- the 3GPP standard only allows values within the range 50 dBm to ⁇ 10 dBm to be reported, whereas femtocell basestations may be deployed in situations where the CPICH transmit power may be within the range 0 dBm to ⁇ 35 dBm.
- the femtocell basestation determines whether the present value for the variable CPICH_Tx_Power is lower than a threshold value.
- the threshold value is the lowest value that can be reported in accordance with the standard but other threshold values could be set.
- step 54 a value is set for a new parameter, in the form of a CPICH adjustment factor CPICH_Adjustment.
- the value of the CPICH adjustment factor is set as:
- CPICH_Adjustment CPICH_Tx_Power_Min ⁇ CPICH_Tx_Power
- CPICH_Tx_Power_Min is the lowest value that can be reported in accordance with the standard, i.e. ⁇ 10 dBm in this case.
- an adjusted CPICH transmit power value CPICH_Tx_Power_Adjusted is derived, as the sum of the real CPICH transmit power value and the CPICH adjustment factor, i.e.:
- CPICH_Tx_Power_Adjusted CPICH_Tx_Power+CPICH_Adjustment
- the broadcast value for the CPICH transmit power value is used by mobile devices as part of their own power setting.
- a terminal sets an initial power for a first Random Access Channel (RACH) preamble as:
- Preamble_Initial_Power CPICH_Tx_Power+UL_Interference+UL_Required_CI ⁇ CPICH_RSCP
- the values for the CPICH transmit power CPICH_Tx_Power, the uplink interference UL Interference, and the uplink required C/I ratio UL_Required_CI are broadcast from the basestation, and the value for the CPICH received code power CPICH_RSCP is measured in the terminal itself.
- reporting an adjusted CPICH transmit power value would cause the terminal to send signals with excessive power on the uplink.
- step 58 the femtocell basestation forms an adjusted value for the uplink interference value
- the terminal can use the adjusted values for the CPICH power and the uplink interference value without causing problems, because the sum of the adjusted values is the same as the sum of the unadjusted values.
- the terminal can set an initial power for its first RACH preamble exactly in accordance with the standard, without requiring any alteration to its own software, because the adjusted values reported by the femtocell basestation still produce the correct result.
- the CPICH adjustment factor is reported. Specifically, the value for the CPICH adjustment factor is reported in a specified one of the system information blocks that is not used for any other purpose.
- Software in each femtocell basestation can identify the appropriate system information block, and an upgrade to this software can take account of any change that may be required, for example if an unused system information block is later used for a different purpose.
- step 62 the adjusted value for the CPICH power is reported, and in step 64 the adjusted value for the uplink interference value is reported.
- adjusted values are reported using the mechanisms specified in the standard for reporting the parameter values.
- the process then ends at step 66 .
- step 52 If it is determined in step 52 that the present value for the variable CPICH_Tx_Power is not lower than the threshold value, the process passes to step 68 , in which the unadjusted value for the CPICH power is reported, and to step 70 , in which the unadjusted value for the uplink interference value is reported.
- an adjustment factor of zero can also be reported using the system information block discussed above.
- FIG. 3 is a further flow chart, illustrating a method performed in a femtocell basestation, when detecting signals broadcast by another femtocell basestation in order to assist in its power setting procedure.
- the femtocell basestation detects the CPICH transmit power reported by the other femtocell basestation.
- the femtocell basestation detects whether a CPICH adjustment factor has also been reported by the other femtocell basestation. If so, then, in step 84 , the femtocell basestation determines the true CPICH transmit power of the other femtocell basestation by subtracting the CPICH adjustment factor from the reported value of the CPICH transmit power.
- the femtocell basestation then performs its power setting algorithms, using the determined value for the true CPICH transmit power.
- these algorithms do not form part of the present invention, although one aspect may involve setting its own CPICH transmit power to be equal to the CPICH transmit power of the other femtocell basestation.
Abstract
Description
- This invention relates to a power control system, for use in a basestation of a mobile communication system.
- It is recognized that power control of transmissions in a mobile communications system is important, particularly in cellular systems using Code Division Multiple Access (CDMA), but not only in such systems. If transmission powers are too low, then transmitted signals will not be able to be received correctly. However, if transmission powers are too high, this implies excessive battery use (in the case of uplink transmissions, from the wireless device to the basestation), and an increased possibility of interference with other transmissions, and hence reduced system capacity. Therefore, communications standards that define the requirements of such systems describe in detail the manner in which such power control can be achieved.
- For example, the 3GPP specifications define the format of messages that can be exchanged between a cellular basestation and a mobile terminal, in order to achieve the required transmission powers.
- There now exist femtocell basestations, which are intended to provide cellular coverage over small areas, for example within a user's home or office premises. It has been found that the messages defined in the 3GPP specifications do not adequately cover all of the possible deployments of such a femtocell basestation.
- According to an aspect of the present invention, there is provided a basestation, for use in a cellular communications network, having a mechanism for reporting its transmit power, the basestation being configured, when its transmit power is outside a reportable range, to report an adjusted transmit power within the reportable range, and also to transmit an adjustment factor, by which the adjusted transmit power differs from the transmit power.
- According to a second aspect of the present invention, there is provided a basestation, for use in a cellular communications network, wherein the basestation is configured to adapt its power settings based on a reported transmit power of at least one other basestation, and is further configured to detect the reported transmit power of the at least one other basestation and to detect an adjustment factor transmitted separately by the at least one other basestation, and to adapt its power settings based on a sum of the reported transmit power and the adjustment factor.
- For a better understanding of the present invention, and to show how it can be put into effect, reference will now be made, by way of example, to the accompanying drawings, in which:
-
FIG. 1 illustrates a part of a mobile communications network. -
FIG. 2 is a flow chart, illustrating a first method in accordance with the invention. -
FIG. 3 is a flow chart, illustrating a second method in accordance with the invention. -
FIG. 1 illustrates a part of a cellular mobile communications network. Afirst femtocell basestation 10 has a connection to a wide area network (WAN) 12 such as the internet, allowing it to connect into thecore network 14 of a mobile network operator. A second femtocellbasestation 16 operated by the same mobile network operator has a similar connection over the wide area network (WAN) 12, allowing it too to connect into thecore network 14. Part of thecore network 14 is amanagement node 20, which is able to monitor the operation of thefemtocell basestations wide area network 12. - As is recognized, each of the
femtocell basestations mobile phone 18, to establish a connection to one of the femtocell basestations, and therefore obtain a cellular service. It will therefore be appreciated that thefemtocell basestations - At the same time, since the femtocell
basestations - It is therefore important to provide suitable power control algorithms, in order to reduce the possibility of interference between the relevant transmissions.
- In this illustrated embodiment, the mobile communications network containing the
femtocell basestations - The
femtocell basestations femtocell basestation femtocell basestation - As mentioned above, basestations and wireless devices must operate with suitable power control. The
femtocell basestations - One femtocell basestation, in order to determine the initial maximum downlink power of a nearby femtocell basestation, can in principle use the value for the CPICH (Common Pilot Channel) transmit power that is broadcast by that nearby femtocell basestation in accordance with the 3GPP specifications. However, femtocell basestations can be deployed in ways not envisaged in the 3GPP specifications, with the result that the nearby femtocell basestation may not be able to report its CPICH transmit power accurately using the mechanism provided in the 3GPP specifications.
-
FIG. 2 therefore illustrates a method, by which a femtocell basestation can report its transmit power. - In
step 50, the femtocell basestation determines its present transmit power, and in particular its present value for the variable CPICH_Tx_Power. As mentioned above, the 3GPP specification defines a mechanism by which a basestation can report this value, by including the value in a specified one of the system information blocks. Mobile devices in the coverage area of the basestation can detect the reported value, as required. - However, the 3GPP standard only allows values within the
range 50 dBm to −10 dBm to be reported, whereas femtocell basestations may be deployed in situations where the CPICH transmit power may be within the range 0 dBm to −35 dBm. - In
step 52, the femtocell basestation determines whether the present value for the variable CPICH_Tx_Power is lower than a threshold value. In this illustrated embodiment, the threshold value is the lowest value that can be reported in accordance with the standard but other threshold values could be set. - If the present value for the variable CPICH_Tx_Power is lower than the threshold value, the process passes to
step 54, in which a value is set for a new parameter, in the form of a CPICH adjustment factor CPICH_Adjustment. The value of the CPICH adjustment factor is set as: -
CPICH_Adjustment=CPICH_Tx_Power_Min−CPICH_Tx_Power - where CPICH_Tx_Power_Min is the lowest value that can be reported in accordance with the standard, i.e. −10 dBm in this case.
- In
step 56, an adjusted CPICH transmit power value CPICH_Tx_Power_Adjusted is derived, as the sum of the real CPICH transmit power value and the CPICH adjustment factor, i.e.: -
CPICH_Tx_Power_Adjusted=CPICH_Tx_Power+CPICH_Adjustment - As mentioned previously, the broadcast value for the CPICH transmit power value is used by mobile devices as part of their own power setting. For example, a terminal sets an initial power for a first Random Access Channel (RACH) preamble as:
-
Preamble_Initial_Power=CPICH_Tx_Power+UL_Interference+UL_Required_CI−CPICH_RSCP - where the values for the CPICH transmit power CPICH_Tx_Power, the uplink interference UL Interference, and the uplink required C/I ratio UL_Required_CI are broadcast from the basestation, and the value for the CPICH received code power CPICH_RSCP is measured in the terminal itself.
- It can therefore be seen that reporting an adjusted CPICH transmit power value would cause the terminal to send signals with excessive power on the uplink.
- Therefore, in order to avoid this problem, in
step 58, the femtocell basestation forms an adjusted value for the uplink interference value -
UL_Interference_Adjusted=UL_Interference−CPICH_Adjustment - This means that the terminal can use the adjusted values for the CPICH power and the uplink interference value without causing problems, because the sum of the adjusted values is the same as the sum of the unadjusted values. Thus, the terminal can set an initial power for its first RACH preamble exactly in accordance with the standard, without requiring any alteration to its own software, because the adjusted values reported by the femtocell basestation still produce the correct result.
- In
step 60, the CPICH adjustment factor is reported. Specifically, the value for the CPICH adjustment factor is reported in a specified one of the system information blocks that is not used for any other purpose. Software in each femtocell basestation can identify the appropriate system information block, and an upgrade to this software can take account of any change that may be required, for example if an unused system information block is later used for a different purpose. - In
step 62, the adjusted value for the CPICH power is reported, and instep 64 the adjusted value for the uplink interference value is reported. These adjusted values are reported using the mechanisms specified in the standard for reporting the parameter values. - The process then ends at
step 66. - If it is determined in
step 52 that the present value for the variable CPICH_Tx_Power is not lower than the threshold value, the process passes tostep 68, in which the unadjusted value for the CPICH power is reported, and tostep 70, in which the unadjusted value for the uplink interference value is reported. In this case, an adjustment factor of zero can also be reported using the system information block discussed above. -
FIG. 3 is a further flow chart, illustrating a method performed in a femtocell basestation, when detecting signals broadcast by another femtocell basestation in order to assist in its power setting procedure. - In
step 80, the femtocell basestation detects the CPICH transmit power reported by the other femtocell basestation. Instep 82, the femtocell basestation detects whether a CPICH adjustment factor has also been reported by the other femtocell basestation. If so, then, instep 84, the femtocell basestation determines the true CPICH transmit power of the other femtocell basestation by subtracting the CPICH adjustment factor from the reported value of the CPICH transmit power. - In
step 86, the femtocell basestation then performs its power setting algorithms, using the determined value for the true CPICH transmit power. As mentioned above, these algorithms do not form part of the present invention, although one aspect may involve setting its own CPICH transmit power to be equal to the CPICH transmit power of the other femtocell basestation. - There is thus described a system for allowing a transmit power value to be reported, even when the true values falls outside a range that is reportable in accordance with the standard, while allowing terminals to perform their own power setting without modification.
Claims (12)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0806940.3A GB2459641B (en) | 2008-04-16 | 2008-04-16 | Basestation power control |
GB0806940.3 | 2008-04-16 | ||
PCT/GB2009/050377 WO2009127874A1 (en) | 2008-04-16 | 2009-04-16 | Basestation power control |
Publications (2)
Publication Number | Publication Date |
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US20110039596A1 true US20110039596A1 (en) | 2011-02-17 |
US8364194B2 US8364194B2 (en) | 2013-01-29 |
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US12/936,381 Active 2030-03-30 US8364194B2 (en) | 2008-04-16 | 2009-04-16 | Basestation power control |
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US (1) | US8364194B2 (en) |
EP (1) | EP2269409B1 (en) |
JP (1) | JP5292460B2 (en) |
GB (1) | GB2459641B (en) |
WO (1) | WO2009127874A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110105110A1 (en) * | 2009-04-22 | 2011-05-05 | Percello Ltd. | Dynamically controlling a femtocell base station downlink range for interference avoidance |
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JP5083462B2 (en) * | 2009-04-24 | 2012-11-28 | 日本電気株式会社 | Communications system |
WO2012016576A1 (en) * | 2010-08-04 | 2012-02-09 | Glycotope Gmbh | Improved recombinant human follicle-stimulating hormone |
Citations (2)
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US20030189907A1 (en) * | 2002-04-09 | 2003-10-09 | Shoichi Miyamoto | Code division multiple access communication system, and a base station control device and a base station thereof |
US20070254620A1 (en) * | 2006-04-28 | 2007-11-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Dynamic Building of Monitored Set |
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JP4009516B2 (en) * | 2002-10-07 | 2007-11-14 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile communication system, mobile communication method, and control station |
JP4708162B2 (en) * | 2005-11-02 | 2011-06-22 | Kddi株式会社 | Wireless communication system and wireless communication control method |
GB2446196B (en) * | 2007-02-02 | 2010-03-03 | Ubiquisys Ltd | Basestation measurement modes |
-
2008
- 2008-04-16 GB GB0806940.3A patent/GB2459641B/en active Active
-
2009
- 2009-04-16 JP JP2011504540A patent/JP5292460B2/en not_active Expired - Fee Related
- 2009-04-16 EP EP09732421.4A patent/EP2269409B1/en active Active
- 2009-04-16 US US12/936,381 patent/US8364194B2/en active Active
- 2009-04-16 WO PCT/GB2009/050377 patent/WO2009127874A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030189907A1 (en) * | 2002-04-09 | 2003-10-09 | Shoichi Miyamoto | Code division multiple access communication system, and a base station control device and a base station thereof |
US20070254620A1 (en) * | 2006-04-28 | 2007-11-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Dynamic Building of Monitored Set |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110105110A1 (en) * | 2009-04-22 | 2011-05-05 | Percello Ltd. | Dynamically controlling a femtocell base station downlink range for interference avoidance |
US8849336B2 (en) * | 2009-04-22 | 2014-09-30 | Percello Ltd. | Dynamically controlling a Femtocell base station downlink range for interference avoidance |
Also Published As
Publication number | Publication date |
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WO2009127874A1 (en) | 2009-10-22 |
EP2269409A1 (en) | 2011-01-05 |
JP5292460B2 (en) | 2013-09-18 |
GB0806940D0 (en) | 2008-05-21 |
JP2011518511A (en) | 2011-06-23 |
EP2269409B1 (en) | 2020-02-12 |
US8364194B2 (en) | 2013-01-29 |
GB2459641B (en) | 2012-06-27 |
GB2459641A (en) | 2009-11-04 |
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